| article html file updated | 6 February 2020 14:35 CET | Update | https://www.mdpi.com/1999-4893/7/4/685 |
| article html file updated | 7 May 2019 03:43 CEST | Update | N/A |
| article html file updated | 25 March 2019 19:30 CET | Update | N/A |
| article html file updated | 20 April 2016 10:09 CEST | Original file | N/A |
| article pdf uploaded. | 18 December 2014 15:17 CET | Version of Record | https://www.mdpi.com/1999-4893/7/4/685/pdf |
